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    <meta charset="UTF-8">
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    <title>Document</title>
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<body>
    <script>
        // fn();//可以调用吗?
        // function fn() { console.log("我是一个fn函数"); }
        // fn();


        // fun()
        // var fun = function () { console.log("我是一个fun函数"); }
        // fun();
    </script>
</body>

</html>